resync marker support, needed for some mp4 files

Originally committed as revision 358 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-03-24 21:25:04 +00:00
parent 122546a6d1
commit 490922441b
3 changed files with 206 additions and 7 deletions

View File

@ -200,6 +200,8 @@ typedef struct GetBitContext {
int size;
} GetBitContext;
static inline int get_bits_count(GetBitContext *s);
typedef struct VLC {
int bits;
INT16 *table_codes;
@ -551,6 +553,43 @@ static inline unsigned int show_bits(GetBitContext *s, int n)
#endif //!ALT_BITSTREAM_READER
}
static inline int show_aligned_bits(GetBitContext *s, int offset, int n)
{
#ifdef ALT_BITSTREAM_READER
#ifdef ALIGNED_BITSTREAM
int index= (s->index + offset + 7)&(~7);
uint32_t result1= be2me_32( ((uint32_t *)s->buffer)[index>>5] );
uint32_t result2= be2me_32( ((uint32_t *)s->buffer)[(index>>5) + 1] );
#ifdef ARCH_X86
asm ("shldl %%cl, %2, %0\n\t"
: "=r" (result1)
: "0" (result1), "r" (result2), "c" (index));
#else
result1<<= (index&0x1F);
result2= (result2>>1) >> (31-(index&0x1F));
result1|= result2;
#endif
result1>>= 32 - n;
return result1;
#else //ALIGNED_BITSTREAM
int index= (s->index + offset + 7)>>3;
uint32_t result= be2me_32( unaligned32( ((uint8_t *)s->buffer)+index ) );
result>>= 32 - n;
return result;
#endif //!ALIGNED_BITSTREAM
#else //ALT_BITSTREAM_READER
int index= (get_bits_count(s) + offset + 7)>>3;
uint32_t result= be2me_32( unaligned32( ((uint8_t *)s->buf)+index ) );
result>>= 32 - n;
//printf(" %X %X %d \n", (int)(((uint8_t *)s->buf)+index ), (int)s->buf_ptr, s->bit_cnt);
return result;
#endif //!ALT_BITSTREAM_READER
}
static inline void skip_bits(GetBitContext *s, int n){
#ifdef ALT_BITSTREAM_READER
s->index+= n;

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@ -31,6 +31,8 @@
#define RDIV(a,b) ((a) > 0 ? ((a)+((b)>>1))/(b) : ((a)-((b)>>1))/(b))
#define RSHIFT(a,b) ((a) > 0 ? ((a) + (1<<((b)-1)))>>(b) : ((a) + (1<<((b)-1))-1)>>(b))
#define ABS(a) (((a)>=0)?(a):(-(a)))
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#define MIN(a,b) ((a) < (b) ? (a) : (b))
static void h263_encode_block(MpegEncContext * s, DCTELEM * block,
int n);
@ -47,6 +49,8 @@ static int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
static inline int mpeg4_pred_dc(MpegEncContext * s, int n, UINT16 **dc_val_ptr, int *dir_ptr);
static void mpeg4_inv_pred_ac(MpegEncContext * s, INT16 *block, int n,
int dir);
static void mpeg4_decode_sprite_trajectory(MpegEncContext * s);
extern UINT32 inverse[256];
static UINT16 mv_penalty[MAX_FCODE][MAX_MV*2+1];
@ -1262,6 +1266,135 @@ int h263_decode_gob_header(MpegEncContext *s)
}
static inline void memsetw(short *tab, int val, int n)
{
int i;
for(i=0;i<n;i++)
tab[i] = val;
}
static int mpeg4_resync(MpegEncContext *s)
{
int state, v, bits;
int mb_num_bits= av_log2(s->mb_num - 1) + 1;
int header_extension=0, mb_num;
int c_wrap, c_xy, l_wrap, l_xy;
//printf("resync at %d %d\n", s->mb_x, s->mb_y);
//printf("%X\n", show_bits(&s->gb, 24));
if( get_bits_count(&s->gb) > s->gb.size*8-32)
return 0;
align_get_bits(&s->gb);
state = 0xff;
for(;;) {
v = get_bits(&s->gb, 8);
//printf("%X ", v);
state = ((state << 8) | v) & 0xffff;
if (state == 0) break;
if( get_bits_count(&s->gb) > s->gb.size*8-32){
printf("resync failed\n");
return -1;
}
}
//printf("%X\n", show_bits(&s->gb, 24));
bits=0;
while(!get_bits1(&s->gb) && bits<30) bits++;
if(s->pict_type == P_TYPE && bits != s->f_code-1)
printf("marker does not match f_code\n");
//FIXME check bits for B-framess
//printf("%X\n", show_bits(&s->gb, 24));
if(s->shape != RECT_SHAPE){
header_extension= get_bits1(&s->gb);
//FIXME more stuff here
}
mb_num= get_bits(&s->gb, mb_num_bits);
if(mb_num != s->mb_x + s->mb_y*s->mb_width){
printf("MB-num change not supported %d %d\n", mb_num, s->mb_x + s->mb_y*s->mb_width);
// s->mb_x= mb_num % s->mb_width;
// s->mb_y= mb_num / s->mb_width;
//FIXME many vars are wrong now
}
if(s->shape != BIN_ONLY_SHAPE){
s->qscale= get_bits(&s->gb, 5);
h263_dc_scale(s);
}
if(s->shape == RECT_SHAPE){
header_extension= get_bits1(&s->gb);
}
if(header_extension){
int time_incr=0;
printf("header extension not really supported\n");
while (get_bits1(&s->gb) != 0)
time_incr++;
check_marker(&s->gb, "before time_increment in video packed header");
s->time_increment= get_bits(&s->gb, s->time_increment_bits);
if(s->pict_type!=B_TYPE){
s->time_base+= time_incr;
s->last_non_b_time[1]= s->last_non_b_time[0];
s->last_non_b_time[0]= s->time_base*s->time_increment_resolution + s->time_increment;
}else{
s->time= (s->last_non_b_time[1]/s->time_increment_resolution + time_incr)*s->time_increment_resolution;
s->time+= s->time_increment;
}
check_marker(&s->gb, "before vop_coding_type in video packed header");
skip_bits(&s->gb, 2); /* vop coding type */
//FIXME not rect stuff here
if(s->shape != BIN_ONLY_SHAPE){
skip_bits(&s->gb, 3); /* intra dc vlc threshold */
if(s->pict_type == S_TYPE && s->vol_sprite_usage==GMC_SPRITE && s->num_sprite_warping_points){
mpeg4_decode_sprite_trajectory(s);
}
//FIXME reduced res stuff here
if (s->pict_type != I_TYPE) {
s->f_code = get_bits(&s->gb, 3); /* fcode_for */
if(s->f_code==0){
printf("Error, video packet header damaged or not MPEG4 header (f_code=0)\n");
return -1; // makes no sense to continue, as the MV decoding will break very quickly
}
}
if (s->pict_type == B_TYPE) {
s->b_code = get_bits(&s->gb, 3);
}
}
}
//FIXME new-pred stuff
l_wrap= s->block_wrap[0];
l_xy= s->mb_y*l_wrap*2;
c_wrap= s->block_wrap[4];
c_xy= s->mb_y*c_wrap;
/* clean DC */
memsetw(s->dc_val[0] + l_xy, 1024, l_wrap*3);
memsetw(s->dc_val[1] + c_xy, 1024, c_wrap*2);
memsetw(s->dc_val[2] + c_xy, 1024, c_wrap*2);
/* clean AC */
memset(s->ac_val[0] + l_xy, 0, l_wrap*3*16*sizeof(INT16));
memset(s->ac_val[1] + c_xy, 0, c_wrap*2*16*sizeof(INT16));
memset(s->ac_val[2] + c_xy, 0, c_wrap*2*16*sizeof(INT16));
/* clean MV */
memset(s->motion_val + l_xy, 0, l_wrap*3*2*sizeof(INT16));
// memset(s->motion_val, 0, 2*sizeof(INT16)*(2 + s->mb_width*2)*(2 + s->mb_height*2));
s->resync_x_pos= s->mb_x;
s->first_slice_line=1;
return 0;
}
int h263_decode_mb(MpegEncContext *s,
DCTELEM block[6][64])
{
@ -1269,6 +1402,27 @@ int h263_decode_mb(MpegEncContext *s,
INT16 *mot_val;
static INT8 quant_tab[4] = { -1, -2, 1, 2 };
if(s->resync_marker){
if( s->resync_x_pos == s->mb_x+1
|| s->resync_x_pos == s->mb_x){
/* f*ck mpeg4
this is here so we dont need to slowdown h263_pred_motion with it */
if(s->resync_x_pos == s->mb_x+1 && s->mb_x==0){
int xy= s->block_index[0] - s->block_wrap[0];
s->motion_val[xy][0]= s->motion_val[xy+2][0];
s->motion_val[xy][1]= s->motion_val[xy+2][1];
}
s->first_slice_line=0;
s->resync_x_pos=0; // isnt needed but for cleanness sake ;)
}
if(show_aligned_bits(&s->gb, 1, 16) == 0){
if( mpeg4_resync(s) < 0 ) return -1;
}
}
if (s->pict_type == P_TYPE || s->pict_type==S_TYPE) {
if (get_bits1(&s->gb)) {
/* skip mb */
@ -1322,6 +1476,7 @@ int h263_decode_mb(MpegEncContext *s,
s->qscale = 1;
else if (s->qscale > 31)
s->qscale = 31;
h263_dc_scale(s);
}
s->mv_dir = MV_DIR_FORWARD;
if ((cbpc & 16) == 0) {
@ -1441,6 +1596,7 @@ int h263_decode_mb(MpegEncContext *s,
s->qscale = 1;
else if (s->qscale > 31)
s->qscale = 31;
h263_dc_scale(s);
}
}
}else{
@ -1526,6 +1682,7 @@ intra:
s->qscale = 1;
else if (s->qscale > 31)
s->qscale = 31;
h263_dc_scale(s);
}
}
@ -2250,6 +2407,7 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
if (get_bits1(&s->gb) == 1) { /* not_8_bit */
s->quant_precision = get_bits(&s->gb, 4); /* quant_precision */
if(get_bits(&s->gb, 4)!=8) printf("N-bit not supported\n"); /* bits_per_pixel */
if(s->quant_precision!=5) printf("quant precission %d\n", s->quant_precision);
} else {
s->quant_precision = 5;
}
@ -2261,11 +2419,9 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
else s->quarter_sample=0;
if(!get_bits1(&s->gb)) printf("Complexity estimation not supported\n");
#if 0
if(get_bits1(&s->gb)) printf("resync disable\n");
#else
skip_bits1(&s->gb); /* resync_marker_disabled */
#endif
s->resync_marker= !get_bits1(&s->gb); /* resync_marker_disabled */
s->data_partioning= get_bits1(&s->gb);
if(s->data_partioning){
printf("data partitioning not supported\n");
@ -2387,7 +2543,9 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
//FIXME complexity estimation stuff
if (s->shape != BIN_ONLY_SHAPE) {
skip_bits(&s->gb, 3); /* intra dc VLC threshold */
int t;
t=get_bits(&s->gb, 3); /* intra dc VLC threshold */
//printf("threshold %d\n", t);
//FIXME interlaced specific bits
}

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@ -230,6 +230,8 @@ typedef struct MpegEncContext {
int sprite_warping_accuracy;
int low_latency_sprite;
int data_partioning;
int resync_marker;
int resync_x_pos;
/* divx specific, used to workaround (many) bugs in divx5 */
int divx_version;
@ -253,7 +255,7 @@ typedef struct MpegEncContext {
int dc_table_index;
int use_skip_mb_code;
int slice_height; /* in macroblocks */
int first_slice_line;
int first_slice_line; /* used in mpeg4 too to handle resync markers */
int flipflop_rounding;
int bitrate;
/* decompression specific */